linux-kernel - Re: [PATCH] jbd2: set to NULL after kmem_cache

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Date:   Tue, 6 Feb 2018 10:29:40 +0800
From:   Wang Long <wanglong19@...tuan.com>
To:     "Darrick J. Wong" <darrick.wong@...cle.com>
Cc:     tytso@....edu, jack@...e.com, linux-ext4@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] jbd2: set to NULL after kmem_cache_destroy


On 6/2/2018 1:00 AM, Darrick J. Wong wrote:
> On Mon, Feb 05, 2018 at 09:39:17PM +0800, Wang Long wrote:
>> Signed-off-by: Wang Long <wanglong19@...tuan.com>
>> ---
>>   fs/jbd2/journal.c | 9 ++++++---
>>   1 file changed, 6 insertions(+), 3 deletions(-)
>>
>> diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
>> index 93016bb..38dc24c 100644
>> --- a/fs/jbd2/journal.c
>> +++ b/fs/jbd2/journal.c
>> @@ -2649,11 +2649,14 @@ static int __init jbd2_journal_init_handle_cache(void)
>>   
>>   static void jbd2_journal_destroy_handle_cache(void)
>>   {
>> -	if (jbd2_handle_cache)
>> +	if (jbd2_handle_cache) {
>>   		kmem_cache_destroy(jbd2_handle_cache);
> kmem_cache_destroy already handles null pointers, so you can remove the
> conditional test entirely.
>
> --D
Thanks, I will send another patch to remove all conditional test in 
module JBD2.
>> -	if (jbd2_inode_cache)
>> +		jbd2_handle_cache = NULL;
>> +	}
>> +	if (jbd2_inode_cache) {
>>   		kmem_cache_destroy(jbd2_inode_cache);
>> -
>> +		jbd2_inode_cache = NULL;
>> +	}
>>   }
>>   
>>   /*
>> -- 
>> 1.8.3.1
>>